How to fix 421 error cannot connect to SMTP Server Error in Outlook Mail App on Windows 11/10

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Open the Mail application and opt for the “Settings” icon. Under settings, click on the “Accounts”.

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Now, select the email account you want to edit.

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Select the “Change mailbox sync settings” option.

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Next, scroll down and select “Advanced mailbox settings”.

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Now replace “Outgoing (SMTP) email server” information by adding “:26:1” after the outgoing mail server (the address will look like smtp.example.com:26:1) and then check all the below boxes to yes. (SSL connection keeps the data encrypted and safe from malicious users).

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Select “Done” and “Save” and you are complete.

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